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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf9c22ade923a26a3869109b332b86317b38682bbc23b0c804c73ca40cf1b401' 
  AND token = 'eej4J8+g9Nwgccs8Gxwfspe3xJlD0gFHPzg5pLr7k+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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