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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bfec4ca78344c41c4822cf34afb18a98714b5843f319416b0d165ded568a22f' 
  AND token = 'o4hwPIm8MI8zoGzTtuX30DNVK2DL90dFMzyoWWPvzaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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