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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb76010853b8e10e7c53c29ed46e52ce840359cb484a2db96f84b9c9030d34df' 
  AND token = 'uD7Q/maevS1tAylrqA4wH+7fskFHH5xL9j3GOVgfepc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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