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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2d4ed92a0ea176c93c174a2cfeb7b26d04e21fb7a15a791e88c5f858930e666' 
  AND token = 'bClnAx6fcJYQBuOycUUUiOsj1Vd/kE+05PC6AUzQKsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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