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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6005d02d07f8aa35af28ae055d60948a56ef9300be640ecf0aa868f6f24d241d' 
  AND token = 'aag3IDOpOrN7KosGedyZgDTXFYc5kr5kNo49q+GBSw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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