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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d99877241421e29cc476ac2d5b56fcf0d541ea40af00000df20e0bf09b19524' 
  AND token = '1/4BE7Un8pTSC/wqivLfN134H8ycaIKqQwujr8Ow56U=' 
  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"
    }
  }
}