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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9553bcea0edfc8459a438e1044669ae2f6a8a4cae22a627270f0109f1e64f0' 
  AND token = 'BT3f9ZmmIRg8eWZ5oq+v1/Eo0/ufiIWyhtLW2TRbXIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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