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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1774cb89eca3297348b6a5db838bead6ff5b71155b8f6ae36668441ed6c8540c' 
  AND token = 'Sn03z0J1BrHGBRHq5/pgVfzurlIf0PVM6sJNPiFexqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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