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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9d441f4f39aaeb4be8f6027de87b26b612f2db40943b9795a09ee05bfd46a9' 
  AND token = 'VkUD0Y5s1s2FbkBbxgwTSH2H5tKUKNM0RdQ45Y0TU+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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