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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d41a0d2a474cba934c7b17c1fcd97ebc394812c9e87c62ee0e3f31161c36c9' 
  AND token = 'Iv1dme3RavqZNcHb4K6SJUJhqxQcAHm8IHK1+tlTUAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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