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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e9e17996d053a66bcb1d8289662b4d5af0640304617f8d57a11df8a3eb3c62b' 
  AND token = 'Nx3+IWd7e3xNzYhRSLup1SxDIrau3AcB/WlzjZomgaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}