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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9adfecf77b819bee24e8bb4ec59f6d40b198582646a24a36b34d89b6ed279fa5' 
  AND token = 'qlFx7RajXYR/+Y9vFA9fXT0Vln+IVnI0dIKs2eruZWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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