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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e7f174785b63c572bca53178b8579181e58fc85b3597ef045dd4683c2b9265' 
  AND token = 'Bvql4h/Esktq8X/lCS0JtV7hz8wne0PfsA4wRQdteCw=' 
  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"
    }
  }
}