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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47f7da6aaf61a9f61336a10d97ca548efd80fcf9d33ce88c45e883a79f4b2e0e' 
  AND token = '7+i5vPm1UsuQe3gf+M7QI31ajbrfTNDUfrjGWM26Z0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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