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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737a38fe72ab68b628a24d8ab056ee16c7026e71990c50e091a636f0a59832a8' 
  AND token = '/0Swssg+C/BEz18i7EUm+EV1KzeIAKUc6NAelq83iKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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