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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e762a43a1ceb7ae9b0e0c1bbd2dad3820c41df1dada5aa921e2ca141e06ab28' 
  AND token = 'hrGdmDmo+f4WMARFPXTXFDtmNva2bPFzZeLe+8CLdZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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