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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6ee80d7ae097fb161a6490f4b2f2e8ac48ea2512c75bd27c4990ebf78455f2' 
  AND token = 'VVePOV+liV+GaDcwIPcLU/eYoMs/tvTWljR8SXt2bqg=' 
  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"
    }
  }
}