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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3c629509b624ffde6df2086d629b5cb041f0b89528d368a701038bb1d8fb1e' 
  AND token = 'Jwbaf2Hhjb0wuIrXsdZsmJ6nSvXjr0zrAocHy3MOi/o=' 
  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"
    }
  }
}