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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c05d3451cd07d0bfd35dc631cc4329a060936777e6e742fff0137d7cd0261df' 
  AND token = 'eTw481ZbfN3B6pFSjOXD/JeCObwIPMUM7AqSc3/1PJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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