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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8797a8fa6cb3c89c757da8c4119f961788706982f1291e133a454eba812f42ba' 
  AND token = 'VGS3cAZ+X6JXeZXCSSA7rJCgVXxl+Zah2DI6UtkIkHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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