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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29dd0621cd3e6036c25366b2600da1bd1f83a050f71b316c80ad3ae090e7ccb2' 
  AND token = 'bsqlFcZYrmYb9d47qm1lbsVQ7x+3E5uF12eHObjpb54=' 
  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"
    }
  }
}