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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac84f17e3bf934894e9e38e50c7e29eea6ebb8b9ed76f3b6d0fc8f51d01e56c4' 
  AND token = 'vKoCvXLBua8W5hvRyaE3LzzF+h8gEZm29Ze25U7+cH8=' 
  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"
    }
  }
}