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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75765f72b8c338999f8fb35eb0cfcc4fca5eb6e6261a13e29250bb2a33f8bdfc' 
  AND token = '5fYeJRAVgViIulBMG1yeg9MBA7c1qJB4qRxurBm8WOw=' 
  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"
    }
  }
}