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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3559f78d44ff3a271740a6dcfa6fde9f5baa7bb068dc69be0083596800bdd24' 
  AND token = 'RKbcFz22Vwm1pWJcMEdRK4smnJ8TqKR6dWSV4q2K448=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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