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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368ac8c1ed4d3f725ee55ebb50dccbf3951ca344dfa040cf8bb560319f435e15' 
  AND token = 'Y/8cNg1eimVw/rX7TqCbenba9+JMNJYWgoSAN7Q0asA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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