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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577c3868e0f20db8947c4c27be1101587d5b06497bae027e70811dd519638f21' 
  AND token = 'FJSdqDjESDb/o+dxCm220hquuJQBIBbPHZHVXXg89oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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