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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f564c18a8550840799011982ebdb9a3c1e662cf2ba5296b028a33eb9417cb8' 
  AND token = 'oHweX6aGOMpXjn4QDdlpJAU94waVIsx5N6xl/uUrFpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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