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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c58ec904f47c4c973d445e2c66964e51b9f5e9ce56b2617c6c6ecf2ac847271e' 
  AND token = '5DrCmKlb7uqc0XDni0aH/Wb6v7bGGSugfchRPXk0XY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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