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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53646a0ae8e9c2c65fb5d07f8a65fe3cf2833a4f4d2c0053c3190f47e06dc052' 
  AND token = 'pFpkjkn/fKPERfEZEJPQWD+O4LTctTpEQFdjUlSCvkk=' 
  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"
    }
  }
}