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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63ce2f933eb9bdb57ea139d78ca821fe24ec1e9c2825c47fa03f3cd7f148f19' 
  AND token = '8w86b5FeDNvlXo4+eGnZnhxqcHouTM/WDCsFn4tCQvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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