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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2284fe3bd605058ed448d0db5fe3b2484ee9a70294e3d4968020061fa67584ff' 
  AND token = '2/ktWPZMBihIs2VJJwVfkhDJpWj2tD8IZQSJKmSOT/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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