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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c2112d84919767d4ad08d24f8d76b2a59620f3cfd2a581d7f772bb0a6ee89ba' 
  AND token = 'MG/YAjzBU5HiSX4VdrNdFAtcVnrT0j6KWg9GbV6Dy8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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