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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15285ee22e02d9eefc8074d5a84304a37a082520f9b5c54d0a41e1833e4dd8f3' 
  AND token = 'rj6qwlhawFIZi81QXwJR5nLWp/+ZZrlTkIU8hF1lmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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