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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3b7820e28f8c6a12ee9d6f96a3ebe464b43603391c2d99f3b18161c55e11ce' 
  AND token = '2h6vApkjQJ5RmBfCFk5ha7c+cDew6fmDbM+A8YzKW/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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