Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a18bf3a77159a8ac3638d31313d182878dece46dadcfc1780880f4077cabbf' 
  AND token = 'c94k3t4BsOc9snUSlAwUSnHI18cNSF6tXT30SDlaaNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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