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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2986be45422ba2bacc5d84d3251ac508feedcc141862902e5ff4bfb28502ce48' 
  AND token = 'R4D+SQsNtvRO/8rH4XQXfHNXmBi8rgXGjbOXS+j0bqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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