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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45aee08d3001b3e9f1f25bad98d2eb7cfcdacb08e804ed469670dca7df01a5df' 
  AND token = 'stRpQ8eive4brb4tG8s8l8jj4vXAaYUmqsz9RYB7eZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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