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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4239b36becf3393fd5ec851420dd277de5a72f2101ac3cbeda53af600110c445' 
  AND token = 'euAI9MnCm+Vv524WPnoN6RgF46Fn2L//ljicOMA5dF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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