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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3328e7e25e6dbcad6b5c69a432eda0d6f62c87ce95e52bf89aa6c89105354ab' 
  AND token = 'KuRij7rj8e3ojPTAwx4k6gdlLw3PE1JmF4PYZYcBlLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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