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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0402a2d24babcc92246602da335347ed1edd6543505d51ac0a6a2df70d1149e' 
  AND token = 'CccD2lZCFfiQOip37pp5Xr2dsLLaNJR4nwV56+ZBz7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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