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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a05742416cf254b56474d371b526b7cd8833124761d5321cc054f62a8887cbb0' 
  AND token = 'JrZTMZnLPUpc6P0j94GtWsNDT7CpnOGh3IwR7tco9w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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