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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eba0ad01124b9a3749c9b57b10f2bcd4892d7db4cd22b92338eaf026e09212e8' 
  AND token = 'yrheF7653EP2s2K1cULgwO0ITkfd6e8eGlywE0+8L5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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