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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb2c42b7a06c3101045c38d96fc663c51b25fede6f7eb1825f7a1c6211541fc7' 
  AND token = 'bKLFtmxVLCT+vCU7Ws9n1xWGxzEklLO6YQop99Y7EfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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