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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3796d0e2c0a3f6c528b01e4432f702eeb5673cb52e8dba34086318b255eab124' 
  AND token = 'uhwJICWX4DNnApkBmSkE/xAHLKmNssaLb7UHzMumB30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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