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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc5a4e1b158e677dcc468f9e6dbb1d774cdc85c2631a52e3d86ce207d0a9650' 
  AND token = '3gpaKfHfCdOewSDyGT8njrIkpZQM2oCsZ0j6LEnxf8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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