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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa6047a04d5bc1df0c68cc3ff852275474c2ea64088698efeda02f507e8b40f' 
  AND token = 'bZ+MrEKWXFGSKgCU49UJvC3Xg8XZSNcVM+FRPXcUcxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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