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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5b33908c17ef72b1db66ba9309301ff5506f9a5062aaf4ee3f9a6939dd4da2' 
  AND token = 'tV6/l3J+49Edlj5XR7Js5ZE6qsa5aRjpidhn/zNXqNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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