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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee3e91e1123f0df2b35c4a994b00b17da5c613bf36c070609d71b0a4a2eca72' 
  AND token = '5Bc6l6HGeoDE6W8YvQDIW5ORcZJbjQrX1kVMsVRa4G4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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